Local docker repos previously had no write path — the /v2 Docker Registry
API only proxied to upstreams. This makes a local docker repo a genuine
registry so `docker push`/`docker pull` (and podman/skopeo/buildah) work
against it directly, matching the project principle that a local repo is the
real thing rather than a mirror.
- Implement the Docker Registry HTTP API V2 write/read half for local docker
repos: blob uploads (monolithic and chunked POST/PATCH/PUT), manifest push,
tags list, and blob/manifest GET/HEAD.
- Store blobs and manifests through the existing content-addressable store;
keep a local_files reference per (repo, image) so the GC does not reap them.
Tags are mutable (UpsertLocalFile); digests and blobs are immutable.
- Dispatch /v2 reads to the local handler for local docker repos and fall
through to the upstream proxy otherwise; writes are local-docker only.
- Add UpsertLocalFile for mutable tag references.
- Cover the push/pull round-trip with a dockerised e2e test and unit-test the
registry path parser. Document the registry in the README.
Adds a black-box e2e suite that runs against the **built container image** via docker-compose (complementing the in-process `e2e/` testcontainers suite).
## What it does
`make docker-e2e` → `scripts/docker-e2e.sh`: builds the image, brings up the full stack (postgres, redis, minio, artifactapi) plus a static nginx **mock upstream** for hermetic caching, waits for `/health`, runs `go test -tags=dockere2e ./e2e-docker/...`, and tears everything down.
## Coverage
- **Repository lifecycle** — add / change / delete for remote, local and virtual repos.
- **Caching** — one immutable artifact for **each of the 10 remote package types** (generic, docker, helm, pypi, npm, rpm, alpine, puppet, terraform, goproxy) proxied through the mock upstream: first fetch `X-Artifact-Source: remote`, second `cache`, bytes verified against the origin fixture.
- **Local uploads** — generic (upload/download), pypi (wheel + generated `simple/` index), rpm (real package + **automatic repodata** generation).
- **Virtual repositories** — pypi simple-index merge and helm `index.yaml` merge across two members.
## Notes
- The artifactapi host port is parameterised (`ARTIFACTAPI_PORT`, default `8000`; the e2e run uses `8001`) so it does not collide with a locally-running instance. This is the only change to the production `docker-compose.yml`.
- Fixtures under `e2e-docker/fixtures/` are real package files (incl. a real RPM so repodata parsing works); a `.gitignore` negation tracks them over the global ignore of those extensions.
## Validation
Ran `make docker-e2e` locally: **all suites pass** against the containerised product.
---------
Co-authored-by: BenVincent <benvin@main.unkin.net>
Reviewed-on: #97
Co-authored-by: Ben Vincent <ben@unkin.net>
Co-committed-by: Ben Vincent <ben@unkin.net>
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